TPS79418DCQ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The TPS79418DCQ is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 250mA current capacity in SOT-223-6 surface mount packaging. This device is classified as Last Time Buy, indicating end-of-life status. The TPS79418DCQ provides essential power management functionality with integrated protection features including over-current, over-temperature, reverse polarity, and under-voltage lockout protection.

Due to Last Time Buy status, identifying equivalent substitute parts with compatible electrical and mechanical specifications is necessary for design continuity and long-term supply chain planning.

Substiute Parts

TPS79418DCQ

Texas InstrumentsIn Stock: 2090TPS79418DCQ Datasheet

Current PartRFQ

TPS79618DCQR

Texas InstrumentsIn Stock: 3204TPS79618DCQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS79418DCQ is determined by the following critical parameters:

• Output voltage specification: 1.8V fixed output
• Package compatibility: SOT-223-6 surface mount
• Input voltage range: Maximum 5.5V
• Operating temperature range: -40°C ~ 125°C
• Protection feature set: Over-current, over-temperature, reverse polarity, and UVLO protection
• Regulatory compliance: ROHS3 compliance and REACH unaffected status

The TPS79618DCQR qualifies as a direct substitute based on matching all critical electrical specifications and package requirements. The substitute maintains identical output voltage, input voltage maximum, operating temperature range, protection features, and SOT-223-6 packaging. Differences in output current capacity and quiescent current represent enhanced performance characteristics that do not prevent substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The TPS79618DCQR is a qualified substitute for the TPS79418DCQ based on the following engineering criteria:

Electrical compatibility is established through matching output voltage specification (1.8V), input voltage maximum (5.5V), operating temperature range (-40°C ~ 125°C), and protection feature set. The SOT-223-6 package ensures mechanical and thermal compatibility without PCB redesign.

The TPS79618DCQR maintains ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements equivalent to the original part. The substitute's Active product status provides long-term availability and supply chain stability compared to the Last Time Buy status of the TPS79418DCQ.

Performance enhancements in the substitute include higher output current capacity (1A versus 250mA) and comparable PSRR performance. These characteristics do not introduce incompatibility and provide design margin for applications operating near the original part's current limits.

Frequently Asked Questions (FAQ)

Q: Can the TPS79618DCQR directly replace the TPS79418DCQ without PCB modifications?

A: Yes. Both devices use identical SOT-223-6 packaging with matching pin configurations and electrical interface requirements. No PCB layout changes are necessary.

Q: What is the primary difference between these two parts?

A: The TPS79618DCQR provides higher output current capacity (1A) compared to the TPS79418DCQ (250mA). Both maintain identical 1.8V output voltage and input voltage specifications.

Q: Are there any compliance or certification differences?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. Regulatory compliance is equivalent between the two devices.

Q: Why is the TPS79418DCQ marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this product line. The TPS79618DCQR represents the active replacement offering from the manufacturer.

Q: Will the higher quiescent current of the TPS79618DCQR affect my application?

A: The quiescent current difference (385 µA versus 220 µA) is 165 µA. This impact is application-dependent and should be evaluated based on specific power budget requirements and duty cycle characteristics.

Q: Are the protection features identical?

A: Yes. Both devices include over-current, over-temperature, reverse polarity, and under-voltage lockout (UVLO) protection with identical control features.